| abstract |
Provided is an antifoaming agent for a coating agent, which suppresses foaming of a coating agent by being blended into a nonaqueous agent in a small amount, thereby improving pinhole preventing performance, and which may form a thermo-setting coating film or a thermo-drying coating film having an excellent aesthetic appearance by suppressing the generation of pinholes without deteriorating smoothing performance of the coating film even under conditions where pinholes are easily generated. The antifoaming agent for the nonaqueous agent comprises a copolymerization product having a weight-molecular weight of 10,000-350,000, which is copolymerized with 2-40 parts by weight of a hydrophilic monomer at least of one selected form the group consisting of: an N-vinyl lactam monomer; tetrahydrofurfuryl (meth)acrylate monomer; a (meth)acrylate monomer; a (meth)acrylamide monomer; and a hydroxyalkyl (meth)acrylate monomer, and 60-98 parts by weight of an alkyl (meth)acrylate having an alkyl group and/or a hydrophobic monomer of vinyl ether having an alkyl group. |